JPH05292663A - Electronic circuit and semiconductor circuit - Google Patents

Abstract

PURPOSE:To suppress noises passing through power supply lines connecting a plurality of circuit blocks or ground lines, and to prevent a latch-up and the breakage of circuit elements by connecting sections among the mutual power supply lines and the ground lines by resistive elements to each power supply fed to a plurality of the circuit blocks. CONSTITUTION:A first circuit block 11 is bonded with a first power supply 13 by a first power supply line 18 and a first ground line 19. On the other hand, a second circuit block 12 is connected to a second power supply 14 by a second power supply line 110 and a second ground line 111. The power supply line of the first circuit block 11 and the power supply line of the second circuit block 12 are connected by a resistor 16. The ground line of the first circuit block 11 and the ground line of the second circuit block 12 are bonded by a resistor 17. Accordingly, the transmission of noises generated in the mutual circuit blocks can be inhibited, and the increase of the power-supply voltage difference of the circuit blocks can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit or a semiconductor circuit formed on the same substrate and having a plurality of power sources.

[0002]

2. Description of the Related Art In a semiconductor circuit, when a plurality of circuit block power supply lines or ground lines are connected, noise may be transmitted between the plurality of circuit blocks through this connection. FIG. 3 is a diagram illustrating noise transmitted through the power supply line and the ground line between the plurality of circuit blocks. In FIG. 3, 31 is a first circuit block, 32 is a second circuit block, 33 is a power supply, 34 is a signal between circuit blocks, and 35 is a circuit block.
Is a first power line, 36 is a first ground line, 37 is a second power line, 38 is a second ground line, 39 is a power line between circuit blocks, and 310 is a ground line between circuit blocks. .. In the circuit as shown in FIG. 3, noises generated in the first or second circuit blocks 31 and 32 may be transmitted through the power supply line 39 or the ground line 310 connecting the circuit blocks to each other, which may impair their operations. In particular, when the level of noise generated in a digital circuit block and the analog circuit block are different from each other and the sensitivity to the noise is different, this problem becomes significant.

Conventionally, in order to suppress noise between circuit blocks, the power supply line and the ground line are separated as shown in FIG. In FIG. 4, 41 is a first circuit block,
42 is a second circuit block, 43 is a first power supply, 44 is a second power supply, 45 is a signal between circuit blocks, and 46 is a first
, 47 is a first ground line, 48 is a second power line, and 49 is a second ground line. Signals are mutually input and output between the first circuit block 41 and the second circuit block 42. The first circuit block 41 has a first
The first power source is supplied by the first power line and the first ground line, and the second circuit block 42 is connected to the second power line and the second power line.
The second power source is supplied by the ground line of the. Since the power supply system is separated in this way, noise is not transmitted between the circuit blocks through the power supply line or the ground line.

[0004]

However, in the configuration as shown in FIG. 4, since a plurality of power supplies are used, when the power supplies are started up, a voltage pulse is applied via the signal line 45 due to the deviation of the start-up time. There are cases. According to this, in the case of a CMOS circuit, latch-up may occur,
The circuit element may be destroyed.

In the present invention, while suppressing the noise passing through the power supply line or the ground line connecting a plurality of circuit blocks,
An object of the present invention is to provide an electronic circuit and a semiconductor circuit that suppress latch-up and destruction of circuit elements.

[0006]

According to the present invention, a power source and a ground line are connected with a resistive material for each power source supplied to a plurality of circuit blocks.

[0007]

According to the present invention, the noise components generated in the circuit blocks are suppressed by the resistance components existing in the power supply line and the ground line connecting between the plurality of circuit blocks. Further, since the power supply line and the ground line are connected by the resistance component, the power supply voltage difference between the plurality of circuit blocks can be suppressed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of a semiconductor circuit according to claim 1. In FIG. 1, 11 is a first circuit block,
Reference numeral 12 is a second circuit block, 13 is a first power supply, 14 is a second power supply, 15 is a signal between circuit blocks, 16 is a resistor for connecting a power supply line between circuit blocks, and 17 is a ground between circuit blocks. A resistor connecting the lines, 18 is a first power supply line, 19 is a first ground line, 110 is a second power supply line, and 111 is a second ground line. The configuration will be described below with reference to FIG. The first circuit block 11 is connected to the first power supply 13 by a first power supply line 18 and a second ground line 19, and the second circuit block 12 is connected to the second power supply line 110 and a second ground line. It is connected to the second power supply 14 by the line 111. Further, the power supply line of the first circuit block 11 and the power supply line of the second circuit block 12 are connected by the resistor 16, and the ground line of the first circuit block 11 and the ground line of the second circuit block 12 are connected by the resistor 17. Connected by.

2 (a) and 2 (b) are schematic views of the resistance portion of the semiconductor circuit according to the second aspect. In FIG. 2A, 21 is a semiconductor substrate, 22 is a high resistance region formed in the substrate 21, 23 is a power supply line or ground line of the first circuit block, and 24 is a power supply line of the first circuit block. Or the ground line. In FIG. 2B, 25
Is a semiconductor substrate, 26 is a wiring having high resistance formed on the substrate 25, 27 is a power supply line or ground line of the first circuit block, and 28 is a power supply line or ground line of the first circuit block. The circuit shown in FIG. 1 is formed using the same semiconductor substrate, and a resistor 16 for connecting a power supply line between circuit blocks and a resistor 17 for connecting a ground line between circuit blocks are connected to each other as shown in FIG. It is a semiconductor circuit formed as in b).

The resistors 16 and 17 have a function of suppressing the transmission of noises generated in the circuit blocks, as compared with the case where the power line and the ground line are directly connected. Since the power supply line and the ground line are connected by the resistor, it is possible to suppress an increase in the power supply voltage difference between the circuit blocks.

[0011]

As described above, according to the present invention, as compared with the case where the power supply line and the ground line are directly connected, the resistance of the power supply line is suppressed by the resistance while suppressing the transmission of noises generated in the circuit blocks. Since the ground line is connected, it is possible to suppress an increase in the power supply voltage difference of the circuit block,
It is possible to prevent latch-up and destruction of circuit elements.

Further, when a plurality of circuit blocks are formed by using the same substrate semiconductor, by forming a resistor as a part of the same substrate semiconductor circuit, the number of terminals for connecting the resistors can be reduced. The effect of the present invention is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a semiconductor circuit according to claim 1 of the present invention.

FIG. 2 is a sectional view showing an embodiment of a resistance portion of a semiconductor circuit according to claim 2 of the present invention.

FIG. 3 is a diagram for explaining noise transmission.

FIG. 4 is a diagram showing an example of conventional power supply separation.

[Explanation of symbols]

 11 First Circuit Block 12 Second Circuit Block 13 First Power Supply 14 Second Power Supply 15 Signal Between Circuit Blocks 16 Resistor Connecting Power Supply Line Between Circuit Blocks 17 Resistance Connecting Ground Line Between Circuit Blocks 18 First Power Line 19 First Ground Line 110 Second Power Line 111 Second Ground Line 21 Semiconductor Substrate 22 High Resistance Region Formed in Substrate 23 Power Line or Ground Line of First Circuit Block 24 Power Line or Ground Line of First Circuit Block 25 Semiconductor Substrate 26 Highly Resistive Wiring Formed on Substrate 27 Power Line or Ground Line of First Circuit Block 28 Power Line or Ground Line of First Circuit Block

Claims (2)

[Claims] 1. An electronic circuit having a plurality of power sources,
An electronic circuit in which power lines of different systems or ground lines of different systems are connected via a high resistance element. 2. In a semiconductor circuit formed by using the same semiconductor substrate having a plurality of power sources, a power source of a different system or a ground line of a different system is formed through a high resistance region formed in the substrate or the substrate. Semiconductor circuit connected by high resistance wiring formed on the top.